Just picked up this 996 cluster for $108 shipped. The clock knob isn't there, hope it's just missing and not broken. Bought it from a company on eBay, listing said "is in good, used, working condition with some scratches and normal wear. The item comes as comes as pictured."
EDIT: For you guys that have done this upgrade. Does the clock knob attach to the circuit board? I'll be using my Boxster circuit board.
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